$event["group"] string - A single organization containing related members. This will normally
be the customer of a vendor's application.

$event[l"ocation"] string - Identifier for where the event originated. This will be an IP
address (IPv4 or IPv6), hostname, or device ID.

$event["occurred_at"] string - ISO-8601 datetime at which the event happened, with millisecond precision.

$event["metadata"] string - Arbitrary key-value data containing information associated with the event.
Note: There is a limit of 50 keys. Key names can be up to 40 characters long, and values can be up to 500
characters long.

$event["target_id"] string - Unique identifier of the object or resource being acted upon.

$event["target_name"] string - Display name of the object or resource that is being acted upon.